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One advanced question on this plane...
-Aileron differential Anyone has it? does it work in this kind of plane (with dihedral curved wingtips) and how should it be setup.. Im asking this at this stage after more than a year with it cause the other day i found a rather embarrasing fact.. i wasnt using aileron differential when i tought i was.. When i first setup ailerons in this plane due to my ignorance i used endpoints to set that differential..but that just sets up the limit for movement and not gives anydifferential unless using full stick (found this on my SIG Ninja while at the field after having a bit of adverse yaw with it in some conditions and wondering what it was when i found out my big embarrasing mistake).. While doing some research on aileron differential it seems standard to asign more throw to the top aileron than the bottom one.. but also steped on some guide wich says that if the aileron is hinged at the top rather than the midle ..aileron differential should be inverted (more throw downward than upwards)... and the CF has the ailerons hinged at the top.. So bilded here... anyone can throw some light (we can allways do experimenting on the subjetc) |
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Temple, GA, USA
Joined Jun 2009
2,338 Posts
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I don't think I would suggest using a Dremel to make a new groove. Not thin enough or sharp enough. On the other hand, grinding a hollow in the shaft and using a wheel collar is OK, but unnecessary in some configurations. A wheel collar is really only needed for a (higher power) outside the firewall tractor or a through the firewall pusher.
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I did that.
Later on, I killed it. Difference: with differential the aileron steering (in every way) is a lot les effective. I felt the need to mix in rudder to get a more tactile feeling. Personally, I like the steering without the differential better. The differential is supposed to prevent yaw. But I don't notice any negative effect. |
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I used the collar to replace the spring clips that went zinging off into deep dark spaces of my garage workshop. Eye protection recommended there too. I put an indent in the shaft as added security.
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Temple, GA, USA
Joined Jun 2009
2,338 Posts
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Quote:
This is absolutely not required, but correct aileron differential can make your rolls more axial.Ailerons hinged at the top present more deflective surface when up (hinge to trailing edge) than when down (behind hinge to trailing edge) so they automatically have some differential built in. I believe there are two reasons you want more up aileron: - reduced adverse yaw (less of: left aileron acts like right rudder) - there is "more air" (pressure) below and thus a down aileron is more effective than an up aileron Differential is usually set up in the transmitter, but can be done mechanically by taking the servo arm off and rotating it 45 degrees (or less) and putting it back on, then adjusting the length of the pushrod to re-center the surface. If you wanted to add more differential throw to the CF/FJ, you would rotate the servo arm forward 45 degrees (or less) and lengthen the pushrod a cm or so. You would probably have to trim some foam around the servo arm and pushrod. As that servo for that side gets close to rotated straight forward, further rotation doesn't pull the pushrod at all, while the other side is just getting to the maximum throw location on the servo arm (straight down). Cliff |
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Temple, GA, USA
Joined Jun 2009
2,338 Posts
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Quote:
The slot from a 409 (thin) cutoff wheel is thicker than the width of a small E-clip. Perhaps you were modding bigger motors...I have heard that taking the clips off inside a large clear plastic bag is the way to do it. Never had a big enough bag when I needed it... |
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I get the 409's at 0.6mm thick, the typical groove in some spare 3mm shafts I have is 0.5mm, and the clips are 0.4mm thick. With the Dremel method on a 3mm shaft, there's some added slop but it's OK. |
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So I would have to disagree with you calling the motors crap - I think you may have just got a bad one. |
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